A kind of solid capacitor negative electrode carbon foil and preparation method thereof

Abstract

The invention discloses solid-state capacitance negative carbon foil. The solid-state capacitance negative carbon foil comprises a corrosion aluminum foil layer, wherein the corrosion aluminum foil layer is provided with upper and lower rough surfaces, upper and lower metal transition layers with high affinity to aluminum and graphite are plated on the upper and lower rough surfaces of the corrosion aluminum foil layer respectively through a magnetron sputtering manner, and upper and lower graphite layers are plated on outer surfaces of the upper and lower metal transition layers respectively through a magnetron sputtering manner. A manufacture method of the solid-state capacitance negative carbon foil includes the following steps of taking corrosion aluminum foil with the upper and lower rough surfaces, subsequently performing sputtering plating of the upper and lower metal transition layers with high affinity to aluminum and graphite on the upper and lower surfaces of the corrosion aluminum foil by means of a magnetron sputtering manner under a vacuum condition, and finally performing sputtering plating of a graphite layer on the outer surfaces of the upper and lower metal transition layers through a magnetron sputtering manner again. According to the solid-state capacitance negative carbon foil, the graphite layer is not prone to fall off, and the solid-state capacitance negative carbon foil has the advantages of being long in service life, large in electric capacity, low in leakage rate, small in impedance, and the like.

Description

technical field [0001] The invention relates to a solid capacitor negative electrode carbon foil; the invention also relates to a preparation method of the solid capacitor negative electrode carbon foil. Background technique [0002] Capacitors are mainly used for charge storage, AC filtering, blocking DC voltage, and providing tuning and oscillation. Capacitors with different structures have different capacitance characteristics, and their functions and application ranges are also different. Among them, the solid capacitor negative electrode carbon foil, which uses aluminum foil as the base film and graphite on the surface, has been widely used and promoted because of its high capacitance and relatively low manufacturing cost. [0003] The structure of the currently used solid capacitor negative electrode carbon foil is mainly composed of aluminum foil and graphite compounded on its surface. In actual use, the solid capacitor negative electrode carbon foil with the above st...

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Problems solved by technology

[0003] The structure of the currently used solid capacitor negative electrode carbon foil is mainly composed of aluminum foil and graphite compounded on its surface. The solid capacitor negative electrode carbon foil with the above structure often appears graphite falling off the surface of the aluminum foil in actual use, which affects the capacitor. service life

In order to prevent the graphite from falling off the surface of the aluminum foil and prolong the service life of the carbon foil of the negative electrode of the solid capacitor, in the prior art, a binder is used to make the graphite into a paste and coat it on the surface of the aluminum foil. Although the capacitor of this structure has a certain degree of It can prevent the graphite from falling off the surface of the aluminum foil, but due to the addition of the adhesive, it affects the conductivity and capacitance ratio of the capacitor. In addition, the capacitor with the above structure does not fundamentally solve the problem of graphite falling off the surface of the aluminum foil. Occasionally, graphite will fall off during the process.

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